Electric-lighting system.



PATENTED OCT. 10, 1905.

G. B. PALMER. ELECTRIC LIGHTING SYSTEM.

APPLICATION FILED NOV.l6,1903.

4 SHEETS SHEET 1.

I QM

No. 801,261. PATENTED OCT. 10, 1905. G. E. PALMER.

ELECTRIC LIGHTING SYSTEM.

APPLICATION FILED NOV-1G. 1903.

4 SHEETSSHEET 2.

PATBNTED OCT, 10, 1.905.

G. E. PALMER. ELECTRIC LIGHTING SYSTEM.

APPLIOATION FILED NOV. 16, 1903.

4 SHEETS-SH BET 3.

Z 7 7 A 11 M Q 0 m P W M 1 N No. 801,261. PATENTED OGT.10,1905.

G. E. PALMER.

ELECTRIC LIGHTING SYSTEM. APPLICATION FILED NOV. 16, 1903.

4 SHEETS-SHBET 4.

UNITED STATES PATENT OFFICE.

GRANVILLE E. PALMER, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE- HALF T 0 CHARLES B. PRICE AND FRANK S. PRICE, OF BOSTON, MASSA- CHUSETTS.

ELECTRIC-LIGHTING SYSTEM- Patented Oct. 10, 1905.

Application filed November 16,1903. Serial No. 181,275.

To all whom it may concern Be it known that I, GRANVILLE E. PALMER, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Electric-Lighting Systems, of which the following is aspecification.

This invention has relation to electric-lighting systems, and it is illustrated as embodying a system in which arc-lamps are arranged in-series and derive their power from a constint-potential electrogenerator. Ithas for its object to provide for each of the lampcircuits a controller by means of which an operator at the central station may switch on or cut out any desired series of lamps independently of the others without interfering with the lamps of any other series. It further has for its object the provisionof means at the point of control by which the operator may be. informed of the condition of each lamp-cirCuitthat is, whether it is open or closed.

Referring to the accompanying drawings, Figure 1 represents diagrammatically an electric-lighting system embodying the invention. This figure illustrates the central station having a generator, a main circuit, a series of arelamp circuits in multiple therewith, and a controlling-circuit and mechanism associated therewith. Fig. 2 represents the .switch mechanism for one of the lam p-circuits. Fig. 3represents the mechanism located usually at the central station for illustrating the condition of the various electric-lighting circuits.

.Fig. 4 represents a form of magnet which may be used in my system.

Referring to the drawings and first to Fig. 1, A indicates a central station having therein an alternating-current generator at with a direct-current exciter 6, these being illustrated conventionally.

0 represents the mainv lighting-circuit having connected in multiple a plurality of independent arclighting circuits d d. The lamps in each circuit are indicated at d. Interposed between the main circuit and the lamp-circuits are constant-current regulators, (indicated conventionally at e.)

f indicates the controlling-circuit,which is connected in series with the switch mechanisms, (indicated in Fig. l-conventionally at f,) so that whereas the lamp-circuits d d are all in multiple with relation to each other the switch mechanisms which control said circuits are all in series, as will be hereinafter explained in detail.

The terminals of the circuit f are indicated at f f there being connected to those terminals a double-throw switch by means of which the circuit f may receive either an alternating current from the circuit 0 or a direct current from the exciter b. To this end it will beobserved that with the excitercircuit 6 there is connected in multiple a circuit 6 having its conductors terminating at stationary contactsb in juxtaposition to those at f 7 v a a indicate stationary contacts which are the terminals of a secondary circuit (1 there being a primary circuit in multiple with the main .circuit 0 0', with a static transformer a as shown.

By the switch mechanism (indicated in dotted lines at a) the circuit f may be connected with the alternating circuit a or with a direct circuit d so that either an alternating current or adirect current may be thrown on the line. This is provided for accomplishing certain results, as will be hereinafter explained.

A switch mechanism f is shown in detail in Fig. 2, and reference may now be had thereto for explanation of the details of construction, itbeing understood that said mechanisms are duplicates.

g indicates a double-pole switch s'ubstantially of the form shown in my copending application filed June 1, 1903, Serial N 0. 159,471. This switch is immersed in an oil-bath contained within a receptacle g. The two conductors forming a portion of the lightingcircuit d are connected with the arms g, in

which the movable double-pole switch 9* is.

mounted. g indicates the stationary contacts, which are electrically connected and with which the movable contact may be engaged to short-circuit the lamp-circuit 03 when the lamps are cut out. g indicates the stationary contacts, which are respectively connected with the conductors of the lamp-circuit d. These parts are shown in side elevation; but it will be understood that there are two contacts g and two contacts g and that the two arms or poles of the switch are electrically disconnected.

To operate the switch g and cut out or cut in the lamps, there is connected to the switch,

by means of a link g", an arm g on the rockshaft (1 at the top of the receptacle g To this shaft is connected 2. long lever g which is normally held downward by a spring 9, so as to cut out the lamps in the lamp-circuit. This lever is adapted to be moved upward by electromagnetic mechanism controlled by the starting-circuit f. (Shown in heavy black lines in Fig. 2.)

it indicates an electromagnet ot' the solenoid I type, in which the cores It are connected to 3; plunger or bar If, moving in guides It. The lower end of the plunger has a pin-andslot connection, with the link h pivoted to the lever g Consequently when the electromagnet is energized the bar if is drawn upward to throw the switch 1 and cut in the lights.

In order that the switch may be held in its operative position, the light-circuit (Z has included therein in series a solenoid magnet 71, the core 2" of which is adapted to actuate a latch mechanism which engages a device carried by the end of said lever g. The latch mechanism consists of two angular levers or latches 11 i pivoted at i 11 respectively, and having their ends adapted to enter notches in the sides of a slide Q1, attached by a pin-andslot connection with the end of the lever The shorter arms of the latchesproject toward each other, and the slide z moves between them, being guided in its movement by a guide i The longer arms of the latches are provided with pins 2', projecting through converging slots in a head 2' upon the lower end of the plunger or core a". By virtue of this construction when the slide 2" is moved upward by reason of the energizing of the magnet h the current passing through the circuit 0? causes the energizing of the magnet t and a consequent upward movement of the plunger 2', so that the pins 71 i in the latches t" are moved away from each other and the ends of the smaller arms of said latches are caused to enter the notches in the sides of the slide 2'", whereby the lever i will be locked in its raised position so long as current continues to flow through the magnet z.

The magnet it is so wound and constructed that it will operate to raise the plunger if only when a direct current is passed through the starting-circuit and is not affected by the passage of an alternating current. This is fora particular purpose, as will be subsequently explained.

In Fig. 4 is illustrated a form of magnet in repulsion of said coil it sufiicient to overcome the magnetic attraction of the core It, so as to prevent the said core or plunger from rising. I do not herein specifically claim a magnet and its core or plunger thus constructed.

In order to selectively actuate any one of the switches g, the following mechanism is employed: A disk j of conductive material is rotatively mounted upon an arbor j and is provided with a series of ratchet-teeth fdouble in number to the light-circuits on the main line. This disk is provided with a section ,7' of insulating material, as indicated. j indicates a brush which rests against the disk, and said brush and disk are connected in multiple with the magnet it by the branch circuit, (indicated at f.)

It will be understood that so long as the current can traverse the circuit f including the disk j and the brush j, it will not traverse the coils of the magnet h, owing to the high resistance of the magnet. When, however, the brush rests upon the insulation j, the current in the starting-circuit f will he forced through the magnet h to energize the same and effect the actuation of the switch So long then as the brush 3" rests upon the metallic portion of the disk j the passing of a current through the starting-circuit f will have no eliect upon the magnet h and upon the switch g.

For the actuation or step-by-step rotation of the disk 3' a magnet It is placed in the circuit f, and its core or plunger it", which is guided by the guide ir carries aspring-presscd pawl 75, adapted to engage the teeth of the ratchet f. The magnetic is so wound and constructed that it is energized to move the plunger it" by the passageof either a direct current or an alternating current through its chils. The purpose of this is that the rotary disk j for each of the lighting-circuits may be rotated each time a current is sent through the starting-circuit, whether the current be direct or alternating, whereas the mechanism which operates the switch Q will be actuated imly when a direct current is thrown onto the inc. 1

Assuming that there are, for instance, eight lighting-circuits on the main line, and therefore eight independent switch mechanisms f, as indicated conventionally in Fig. 1, each disk jwill be provided with sixteen teeth. For the purpose of centering or indexing the disk, it is provided with a toothed stop-wheel j with which is adapted to coact a spring pressed lazy-pawl i Although but one disk 9' is illustrated, it will be understood that they are so arranged in the several switch mechanisms that no two of the insulated por-' tions j bear the same relation to the brush j at the same time. This is, as described, in order that the magnets k may be selectively actuated one at a time. From this descrip- ,tion it will be seen that by throwing the switch a to the right in Fig. 1, so as to throw the alternating current on the circuit f, the magnet k may be energized successively to effect the rotation of the disk j to a point until the insulated portion j is just to the right of. the brush j, as indicated in dotted lines in Fig. 2. Then by reversing the switch a the direct current is thrown on the line. This causes the disk j to be advanced one step, and the brush 1" will then rest upon the insulated portion j of the disk. The'reupon the direct current will be caused to flow through the magnet it and the plunger b will be raised to lift the switch-lever g and cut in the lamp-circuit d. I As soon as the lamp-circuit is cut in, of course, thecurrent passes through the magnet 71 and the latch mechanism is actuated to maintain the switch g in its closed position through the medium of the devices hereinbefore described. The switchlever-a is then moved to a neutral position to break the circuitf. From this description it has been made clear that an operator at the central station may cut in any one of the lamp-circuits d without cutting in the others,

. and it will be apparent that should the lightcircuit be broken or opened the current will fail to pass through the magnet e', and consequently' the latch mechanism 5 will release the slide d,'and the spring will open the switch g, so as to cut out the lamp-circuit d automatically by causing the arms of the switch g to engage the stationary contacts 9 This is of particular value where the tub transformer B is employed, as indicated conventionally in Fig. 2. Mechanism is provided,

however, by means of which the operator at the central station may selectively cut out any one of the lamp-circuits 6 without atfecting any of the others of said circuits. This is accomplished by means of the following devices: m indicatesa diskmounted to rotate upon a-stud m. This disk has associated with it a-four-toothed ratchet m adapted to be engaged and advanced with a step-by-step movement by a springtensioned pawl m mounted upon the plunger if. A stationary brush m bears upon the disk, and the arbor m and the brush m are connected in multiple with the lighting-circuit d by means'of the conductors or. This branch circuit operates when closed to short-circuit the electromagnet c by reason of the greater resistance of the magnet. The disk m is formed of two sections, o.ne,(indicated at 121 of metal, and the other,(-indicated at m,)of insulating material. It has been stated that the ratchet m has four teeth, so that it will be seen that for two steps of the disk the 'brush m will rest upon the insulated section'thereof, while for the next two succeeding steps the brush will rest uponthe metallic portion.

When the branch circuit d is closed by reason of the brush m engaging the metallic section of the disk, the current through the lamption of first cutting in and then cutting out the lam p-circuit.

In cutting in the lamp-circuit, the disk mwill be in the relative position shown in Fig. 2, and the disk j will have been rotated until theinsulated portion occupies the dotted position. Then the direct current will be thrown onto the line'fwith the result that the disk j will be given one step to bring the insulated portion 1' under the brush j, in consequence of which the magnet it will be energized and the switch g move to cut in the lamp-circuit with the consequent result that the slide 2" will be locked in its raised position by the closing of the current through the magnete', the moving of the plunger 7& will advance the disk m until the brush mrests on the section m, and the lighting-current will be caused to pass through saidmagnet z, inasmuch asthe branch circuit d is now broken. Then the circuit f is interrupted and with the failure of current in the magnet It the plunger b will drop, due to the pin-and-slot connection with the link h,--although at this time the slide e" will remain locked in its raised position.- thrown a second time upon the line by the operator to advance the disk j one step; but before the magnet 10 has had time to mechanically actuate the disk the current will have passed through the magnet h to raise the plunger if and rotate the disk m another step. As soon as the insulated section of the disk passes beyond the brush j the current through the magnet h is cut out by the circuit f and the plunger h will again drop. This leaves the switch-lever still raised and locked in its raised position by the passage of the current through the magnet a, so that upon the failure of the current in the lighting-circuit d the magnete' will be denergized to automatically cut out said lighting-circuit. The reason for effecting this second step in the rotation of the disk m is to place the disk m in position to permit the operator to cut out the lighting-circuit upon the next step of said disk. While the disk at remains in the position to which it was last moved, according to this description the operator is free to send alternating and direct currents through the starting-circuit to rotate the diskjand otherswitch mechanisms f without disturbing said disk m, for it will be remembered that except when the brush j is engaged with theinsulated section j of the disk 7', either an alternating current or a direct current may be thrown by the operator on The direct current will then bethe line f to control some other lighting-circuit without affecting in any way the magnet It or the disk m, for the reason previously explained, and it will be further seen that by means of an alternating current the disk jin any one of the switch mechanisms may be brought to a proper position to permit the actuation of the magnet II- by a direct current without disturbing or otherwise interfering with the other lighting-circuits.

Now the operation of selectively cutting out-any one of the lighting-circuits will be explained. When acurrent is traversing the light-circuit d from the main circuit a, the disk at is in position with the brush m upon the insulated section in, so that the next step of the disk will cause the brush to engage the metallic section to short-circuit the magnet '11, and consequently to cut out the lamp-circuit the disk j is rotated with a step-by-step movement by intermittently throwing onto the linef the alternating current until the insulated section f occupies the position shown in Fig. 2. Then the operator throws onto the linef the direct current with the result that the disk j is advanced one step, the magnet ]i is energized to raise the plunger k and rotate the disk 12?. one step, whereupon the magnet i is immediately short-circuited to permit its core to drop and effect the release of the slide j by the latches, in consequence of which the switch y will be opened and the lighting-current short-circuited through the contacts g Although the lamps in the circuit (Z are out, yet it is necessary for the operator to again throw the direct current onto the line to effect a second rotative step of the disk m in order that the circuit may be again thrown on the line by performing the steps hereinbefore described in that connection.

According to the foregoing description it is essential for the operator to selectively cut in and to selectively cut out the lamp-circuit to throw the direct-current four times upon the line. This is by reason of the provision of the four-toothed ratchet. By the substitution, however, of a mechanical equivalent for the pawl-and-ratchet mechanism it is possible to cut in the light-circuit with a single energization of the magnet h and cut out the lightcircuit with but one energization, so that it will be understood that there is no intention to limit the invention to the particular means which 1 have seen fit to illustrate.

One of the striking features of the invention is the employmentof electric currents of different characteristics for effecting the rotation of the selective disks j and the actuation of the switches g. The employment of these currents enables the operator to freely rotate the disks to bring any one of them to a position to cut in or cut out a light without affecting any of the other light-circuits, since although the insulated section 1" of any disk may during its rotation be engaged with the comet trated conventionally at a in Fig, 2, but shown indetail in Figs. 1 and 3.)

Referring to the last-mentioned figure, it

will be observed that this indicating apparatus includes a plurality of indicating toothed disks 0', independently journaled upon a wheel or disk 0 itself mounted to rotate upon an arbor 0 Associated with the disk is a sixteen-toothed ratchet 0*, which when rotated with a step-by-step movement eifects a similar rotation of the disk 0 with a constant revolution of the disks 0. There is one indicating-disk 0' for each lamp-circuit, and as eight circuits have been illustrated in Fig. 1 there are eight disks, andthey bear the Words On and Off for the purpose of indicating whether or not the lights are turned on or turned off. For each disk there is a symbol corresponding to the light-circuit.

19 indicates a solenoid-magnet which is so wound and constructed that it will be energized to effect the actuation of the plunger or core 1) by either an alternating or a direct current. This plunger carries a spring-tensioned pawl p whereby when the plunger is raised the ratchet 0 will be advanced one step. To the core 1) is attached the piston 2* of the dash-pot 19 so that the ratchet will not throw over.

The disks 0 are each provided with four teeth to correspond to the number of teeth on the disks m, and it is desired that each time one of the disks m is actuated the corresponding disk 0 will be actuated. To this end there is arranged above the disks 0 a forked slide q, movable in a guide q. To the slide is attached the outer end of a lever g bearing the armature (f of an electromagnet (1 This magnet g is similar to. those at h in so far as it responds only to direct currents. The magnet 19 and the magnet g are both in series in the circuit f, so that each time an impulse is sent over the line the plunger 12 is actuated irrespective of whether the current be direct or alternating, whereas the slide q is moved downward only when the direct current is sent over the line. The slide (1 is bifurcated, as stated, having the two fingers Q5 (f. When the slide occupies its uppermost position, as indicated in dotted lines in Fig. 3, the disk 0 may be rotated freely without the engagement of any of the disks or indicator-wheels 0' with the fingers. The spring 9 holds the slide in this position normally.

I When, however, the operator has effected the simultaneous rotation of all of the disks 7' in the switch mechanism to bring the insulated section on any one of them into position to cut in or cut out one of the light-circuits, the ratchet 0 is advanced step by step simultaneously with said disks, and if it be assumed, for instance, that the light-circuit (l in Fig. 2 be numbered 1, so as to correspond with the number 1 indicator-wheel on the disk 0 in Fig. 3, then said disk 0 will occupy the position shown in Fig. 3 when the disk j in Fig. 2 occupies the position there shown. Then upon the turning of the direct current on the line the magnet 11 will be energized coincidently with the energizing of the magnet 1), so that instantly the slide q will be forced downwardly. The movement of the plunger jp will be necessarily slow on account of the dash-pot 2, so that before the ratchet 0* is rotated one step the finger q will be in such position that it will engage one of the teeth 0 on number 1 wheel 0', so that as the wheel moves by it it will be given a quarter-turn. Then when the operator turns the direct current for a second time upon the line the rotation of the ratchet 0 will cause the next tooth 0 of number 1 wheel 0 to engage the finger q, so that by this time number l wheel 0 will have been given a half-turn, so that either the word On or Off will be exposed, corresponding to whether the lights in the circuit d are turned on or oil. In this way the operator secures an automatic control over the indicating mechanism, so that said mechanism shows the condition of'the various electriclight circuits. The words On and Off upon the several wheels or disks 0 are alternately exposed and concealed, as illustrated. In selecting and turning onand off any one circuit the proper indicator-disk is selected and actuated simultaneously.

It is quite apparent that instead of employing an alternating current and a direct current any other currents having different characteristics may be employed either from the same generator or from two generators, as illustrated upon the drawings.

The lamp-circuits constitute a plurality of elements which are selected by an alternating current, but which are acted upon (cut in or cut out in this case) by a direct current. It is evident that other translating devices may be utilized in the work-circuits (Z d instead of lamps and that the selective system may be employed for a variety of purposes.

Having thus explained the nature of the invention and described a way of constructing and using the same, although without attempting to set forth all of the forms in which it may be made or all of the modes of its use, I declare that what I claim is 1. An electric-lighting system comprising a plurality of lamp-circuits in multiple branches, means o erable from one point and independent of said lamp-circuits for selectively cut- 2. An electric-lighting system'comprising a.

plurality of lamp-circuits in multiple branches, each having an independent switch, means independent of said circuits for selectively actuating said switches to cut out the said circuits, and means made ready bythe said selective means for automatically cutting out each lamp-circuit independently of the others upon the failure of said circuit.

3. An electric-lighting system comprising a pluralityoflamp-circuitsinmultiplebranches, each'lamp-circuit having a switch for cutting in or cutting out the lamp or lamps, and having an electromagnet in series therewith for holding the switch in closed position, electrically-act uated means for moving said switch to closed position, and means independent of said lamp-circuit and operable remotely from said switch for effecting the deenergization of said electromagnet for cutting out each lamp-circuit independently of the others upon the failure of said circuit. I

4:. An electric-lighting system comprising a lamp-circuit,a switch in said circuit, and means for automatically operating said switch to out out said lamp-circuit upon the breaking or opening thereof, in combination with means operatableremotely from said switch for actuating said switch at will to cut out said lampcircuit.

5. An electric-lighting system comprising a lamp-circuit, aswitch in said circuit, and means for automatically operating said switch to cut out said lamp-circuit upon the breaking or opening thereof, in combination with means operatable remotely from said switch for opening or closing said switch at will. I

6. An electric-lighting system comprising a lamp-circuit, a switch in said circuit, and means for automatically operating said switch to cut out said lamp-circuit upon the breaking or opening thereof, in combination with an operating-circuit having electromagnetic means for actuating said switch to out out said lampcircuit. I

7. An electric-lighting system comprising a lamp-circuit, a switch in said circuit, and means for automatically operating said switch to cut out said lamp-circuit upon the breaking or opening thereof, in combination with an opcrating-circuit having electromagnetic means for opening or closing the said switch at will.

8. An electric-lighting system comprising a plurality of lamp-circuits in multiple branches,

each having an independent switch, in combination with a circuit independent of the lampcircuits having a normally deenergized electromagnet for actuating each switch, a switchholding magnet in each lamp circuit, and means in said independent circuit for effecting the selective energization of said switchmagnets to deenergize any one of the holdingmagnets and cut out its lamp-circuit.

9. An electric-lighting system comprising a plurality of lamp-circuits, each having an independent switch, an electromagnetic device to hold said switch in a closed position, and a by said electromagnet may be cut in or cut out at will. v

11. An electric-lighting system comprising a lamp-circuit having a switch, an electromagnet in series in said circuit for holding said switch in closed position, a make-and-break appliance for said electromagnet, in combination with an independent circuit having electromagnetic mechanism for actuating said ,make-and-break appliance and means in said independent circuit for actuating said switch.

12. An electric-lighting system comprising a lamp-circuit having a switch, an electromagnet in series therewith f or holding said switch in closed position, a rotatory make-and-break appliance for said electromagnet, in combination with remotely-controlled means for impart-ing a step-by-step rotation to said appliance, means for actuating said'switch, anda single circuit including said remotely-controlled means andsaid actuating means. I

13. An electric-lighting system comprising a plurality of lamp circuits in multiple branches, each having in series both aswitch and an electromagnetic device for holding the switch in a closed position, means for opening each switch when it is released by said holding device, an independent circuit having a make-and-break appliance 'for short-circuiting each of said holding devices, and also having means for closing said switches. I

14. An electric-lighting system comprising a plurality of lamp circuits in multiple branches, each branch having in series a switch, an electromagnetic device for holding said switch in closed position, a make-andbreak appliance in each lamp-circuit in mul-- tiple with the holding device therein to shortcircuit said holding device, and an independcut-circuit including electromagnetic mechanism for actuating said make-and-break appliances and also including electromagnetic mechanism for closing said switches. V

15. 'An electric-lighting system comprising a plurality of lamp-circuits each having a switch, in combination with means, one for each circuit, for moving each switch 1n oppos1te dlrections, a selector for eachof sald out by an alternating current.

means, and provisions including a-single circuit for operating said selectors simultaneously and effecting the actuation of a single means.

. 16. An electric-lighting system comprising a plurality of lamp circuits in multiple branches each branch having a switchin series, in combination with an actuator for each switch, aselector for each actuator, provisions in consequence of which each actuator effects the opening or closing of its switch, and a single circuit controlling said selectors.

. 17 An electric-lighting system comprising a plurality of lamp-circuits, and a circuit having mechanism by which a lamp circuit is selected by an electrical current having certain characteristics, and out in or cut out by electrical current havingcertain other characteristics, said currents being employed succesactuators, and means for throwing on said circuit either an alternating current or a direct current whereby a lamp-circuit is selected by one of said currents and is cut in or out by the other of said currents.

19. An electric-lighting system comprising a lamp-circuit and aswitch therefor, in combination with a circuit having an electromagnetic switch-actuator and an electromagnetic selector, and means for throwing onto said circuit eithcr'an alternating current or a direct current, said actuator and selectorbeing constructed and arranged whereby said actuator responds to one of said currents and the selector responds to both of said currents.

' 20. An electric-lighting system comprising a lamp-circuit and mechanism by which the lamp-circuit is-cutsin or cut out by a direct current, and is selected for cutting in or cutting 21. An electric-lighting system comprising .a plurality of lamp-circuits, and a circuit havwith different sources of electrical supply.

'23. An electric-lighting system comprising a plurality of lamp-circuits, and a circuit having selecting and actuatingmechanism by which a lamp-circuit is selected by an alternating current and cut in or cut out by a direct current, and means for throwing on said circuit either an alternating or a direct current.

24. An electric-lighting system comprising a lamp-circuit, and a switch therefor, in combination with a circuit having an electromagnetic switch-actuator, and an electromagnetic selector for said actuator, said actuator and selector being constructed and arranged whereby they both respond to a current having certain characteristics whereas only one of them responds to a current having different char-- acteristics. 7

25. An electric-lighting system comprising a lamp-circuit, and aswitch therefor,-in com.- bination with a circuit having an electromagnetic switch-actuator, and an electromagnetic selector forsaid actuator, said actuator and selector being constructed and arranged whereby the actuator responds to a direct current, and the selector responds to both a direct and an alternating current.

26. An electric-lighting system comprising a plurality of lamp-circuits, selective mechan-' ism independent of said circuits and operable remotely from said circuits for controlling said circuits, and indicating mechanism for showing the condition of said 'circuits,said

indicating mechanism having a support with a separate automatic-indicator for each circuit.

-27. An electric-lighting system comprising a plurality of lamp-circuits, selective mechanism independent of said circuits and operableremotely from said circuits for controlling said circuits, and indicating mechanism located at the point of control for simultaneously indicating the condition of all of said circuits,

mechanism for selectively controlling each of said lamp-circuits, and electromagnetic mechanism in said controlling-circuit for showing the condition of said circuits, said mechanism having a movable support, an electromagnet for actuating said support, an indicator on said support for each circuit, andan electro-- magnet for controlling said indicators.

29.. An electricelighting system comprising a plurality of lamp-circuits, a circuit having 1 .a switch-actuator and a selector for each circuit controlled by currents of different characteristics, and indicating mechanism in said controlling-circuit including selecting and actuating-mechanism controlled by said currents of different characteristics.

30. The combination with a movable member having one or more stops in its sides, of

- one or more latches pivoted between their ends to engage said stops, an electromagnet, and an armature having connected thereto a member with inclined edges to engage and move the free end or ends of said latch or latches and cause the engagement of the latch or latches with the stop or stops on the movable member.

In testimony whereof I have afiixed my sig nature-in presence of two Witnesses.

GRANVILLE E. PALMER. Witnesses:-

C. O. STEOHER, M. B. MAY. 

